TRENTON — The next two stops on Gov. Chris Christie's ongoing tour of the U.S. will be the two largest cities in neighboring Pennsylvania.

Christie, who has visited more than a dozen states in recent months in his role as chairman of the Republican Governors Association, will visit Pittsburgh on Friday and Philadelphia on Monday to campaign for Pennsylvania Gov. Tom Corbett.

Christie will appear at a few events in the Steel City on Friday afternoon: a fundraiser for Pennsylvania Senate President Joe Scarnati, an RGA finance event, and both a fundraiser and retail stop alongside Corbett.

Three days later, he'll appear with Corbett during a fundraiser at the Union League in central Philly at 6 p.m.

The RGA raises money for Republican gubernatorial candidates across the country. Christie took over as chairman in November, and has since raised more than $33 million and visited 15 states to campaign for them. Last week, he visited New Mexico and Tennessee. Next month, he'll stop in New Hampshire.

The role not only boosts Christie's profile as he considers whether to run for president in 2016, but it also gives him a chance to rebuild his image in the wake of the George Washington Bridge scandal that has engulfed his administration for six months.

Christie stumped for Corbett in his first campaign in 2010. Corbett is one of the Republican governors who has publicly supported Christie amid the bridge controversy.

Their latest appearances together come as Corbett faces a tough battle for a second term. Three polls released last week show him trailing his Democratic challenger, businessman Tom Wolf, by at least 20 points.

Monday's event is slated to draw protestors from the Philadelphia Coalition Advocating for Public Schools. Christie and Corbett have both faced criticism for cuts to education funding.

"These governors both stand for policies that enrich corporations at the expense of working people, for cutting back on public education and health care, for privatizing schools and public services, for disempowering and impoverishing communities of color," the coalition said in a statement on its website today.